If there is MobileSheets on both devices then you connect them and you could select the Mode how the devices interact. The "book Mode" is that what you are looking for. 2 pages side by side.
See also full manual page 150.
See also full manual page 150.
Samsung Galaxy Tab S7 FE Android 12
Samsung Note Pro 12.2 LineageOS 14.1
Huawei Media Pad M3 lite Android 7
Samsung Note Pro 12.2 LineageOS 14.1
Huawei Media Pad M3 lite Android 7